Second sound ACO160EVK Manuel utilisateur

ACO160EVK

Audio‐to‐SynthEvaluationSystem

1 999SW1

Ave.#1617,Miami,FL33130

ACO160EVKAudio‐to‐SynthSystem

DirectaudiopitchtoDCO

square/sawtooth/sineoscillatoroutput

Low‐latencyMIDIoutwithincluded

STM32F100C4uC

1V/octavepitchCVoutput

Zero‐rippleenvelopefollowerwith

eightratesettings

ModulationCVinputwith+/‐2octave

rangeinsemitoneresolution

Gateoutputwithuser‐configurable

threshold

25Hz‐5.2kHzfrequencytrackingrange

Hardsyncsquarewaveoscillatorfrom

10Hz‐10kHzgeneratedbyuC

Applications

Real‐timepitch‐to‐MIDIusingvirtually

anymonophonicaudiosource

Audio‐controlledsynthesizers

Pitch‐to‐CVconverters

Pitch‐dependentaudioprocessing

Harmonizers

Guitarandotherinstrument

effects/stompboxes

Description

TheACO160EVKAudio‐to‐Synthsystemisan

evaluationsystemfortheACO160audio‐

controlledoscillator,anultra‐lowlatency,low‐

powerfrequency‐trackingoscillatorsuitablefor

audio‐controlledmusicsynthesizerapplications.

TheACO160containsafundamentalfrequency

detectorbasedondualswitched‐capacitorpeak

detectorswithfrequency‐dependentdecay

timeforultra‐widedetectionrange,ultrasonic

analogoscillatorandfrequencytrackingengine

thatforcestheanalogoscillatortorunat8192

timesthefrequencyoftheincomingaudio

signaldetectedattheinput.Thisultrasonic

analogoscillatoristhendividedbackdownto

audiorangeusingprogrammabledividersthat

arecontrolledbytheharmonyCVinputand

whichcovera+/‐2octaverangewithsemitone

precisionovertheentirerange.

Additionally,theACO160featuresanintegrated

switched‐capacitorenvelopefollowerwhich

exhibitszeroripple,evenforthelowest

frequencysignalsthechipcandetect(downto

25Hz).Anintegratedgategeneration

comparatorhastheenvelopesignalwiredtoits

positiveinputandallowstheusertosetthe

voltageonthenegativeinput.Thisvoltage

functionsasthegatethresholdandgeneratesa

rail‐to‐railgateCVoutput.

TheACO160EVKadditionallyincludesa

balancedpreampwithcomboXLR+¼”jack

inputwith0‐50dBgain,adjustablehigh‐pass

andlow‐passfiltersforimprovedfrequency

detection(ifneeded)infrontoftheACO160

chip,aVCAcontrolledeitherbythebuilt‐in

envelopefollowerorbyanexternalsource,an

auxiliarymixertomixanothersynthvoiceafter

theVCA,andaSTM32F100C4micro‐controller

toconvertthefrequency,envelopeandgate

informationprovidedbytheACO160chipinto

MIDIcommandstocontroldigitalsynthesizers.

TheACO160EVKismeanttoassistanalogor

digitalsynthmanufacturerswithdesigning

productsusingitsuniqueACOtechnologyandis

notintendedtoserveasafinishedconsumer

product.

OrderingInformation

PartNumber Package Size

ACO160EVK PCB 140mmx120mm

ACO160EVK

  Audio‐to‐SynthEvaluationSystem



2  999SW1

Ave.#1617,Miami,FL33130

BlockDiagramofACO160EVKAudio‐to‐SynthEvaluationSystem



ACO160EVKInputsandOutputs

Name Direction Description

PSUInput Power 9vPSUinputwithpositivesleeve(compatiblewithincludedPSU)

AudioIn Input AudioinputfromNeutrikXLR‐¼”combojack

AudioThru Input/Output Unbalancedminijackaudioinput(LINEIN)andoutput(LINEOUT)after

0‐50dBgainpreamp

Harmony Input 1v/octminijackharmonyinputmodulatessquare/saw/sinefrequencies

over+/‐2octaverangeon12‐noteequal‐temperedscale

VCAIn Input ExternalminijackVCAinput,ifunpatchedVCAiscontrolledbythe

envelopefollowerfromtheACO160chip

AuxIn Input MinijackauxiliaryaudioinputcanbemixedinaftertheVCA

MixOut Output Minijackoutputoftheauxiliaryaudiomixer

MainOut Output ¼”monomainoutput(equivalenttotheauxmixeroutfollowedby

mastervolumecontrol

PitchCV Output 1v/octpitchCVout(minijack)

EnvCV Output 0‐3.3voutputofzero‐rippleenvelopefollower(minijack)

GateCV Output 0‐4.5vgateCVout(minijack)

MIDIout Output StandardMIDIDINoutput



ACO160EVK

  Audio‐to‐SynthEvaluationSystem



3  999SW1

Ave.#1617,Miami,FL33130



ACO160EVKControls

Name Type Description

PreampGain Knob Adjustspreampgainfrom0‐50dB.

HPF Switch High‐passfiltercornerfrequencysetto16/80/160Hz.

LPF Switch Low‐passfiltercornerfrequencysetto300/1.2k/5kHz.

Gate

Threshold

Knob Tunesgatethresholdfrom0vto3.3v.

EnvRate

Select

8‐Pos

Rotary

Switch

Adjuststheenvelopedecayratetoaccommodatevariousinstruments.

Usefastrate(CCW)withfast‐decayingsourceslikebassguitarand

slowerrate(CW)forsourceswithcomplexharmonicprofilelikeviolin.

Wave Switch Selectssquare/saw/sinewaveforprocessingbyVCA.

PitchFreeze Switch Bydefault,connectsgateouttoFTRACKinputtoenablefrequency

tracking.Canbemomentarilyheldinopposingpositiontodisable

frequencytrackingandfreezethecurrentpitch.

Harmony Knob OffsetsharmonyshifttoaccommodatevariousCVranges.

AuxMix Knob MixesVCAoutputwithauxiliaryaudioinputfromAuxIn

OutputLevel Knob Outputmastervolume

SyncFreq Knob AdjustshardsyncoscillatorgeneratedbyuCover10‐10kHzrange.

SettingknobfullyCCWturnsoffthesyncoscillator.Notethatthesync

oscillatorisonlyactiveiftheupperACOModeswitchistotheRIGHT

ACOMode

(S1)

DualSwitch Left/Left(upper/lower): Defaultmode,MIDI,audiobothactive

Right/Left: MIDIoff,hardsyncoscillatoractive

Left/Right: MIDIon,ACOaudiooutputdisabled

Right/Right: Testmodeonly

Bend/Cal

Mode

Switch SetsMIDIpitchbendmode:Left=QuantizeMIDInotesto12‐note

equal‐temperedscale;Middle=Pitchbendover+/‐1quartertoneonly;

Right=Pitchbendoverfull+/‐2semitones.IfCALbuttonishelddown,

generatecalibrationtonesasfollows:Left=100Hz;Middle=

alternating100/800Hz;Right=800Hz

Cal Button Holdbuttondowntogeneratecalibrationtonesasdescribedabovein

descriptionofBend/CalModeswitch.Whenbuttonisreleased

frequency‐to‐MIDInon‐linearitycorrectioncalibrationisperformed.

NOTE:Preampgainandgatethresholdknobsmustbothbeturned

fullyOFF(CCW)forcalibrationtoworkcorrectly!

Alsonotethatthiscalibrationwasperformedbeforeshippingandis

notnecessarytorepeat.Descriptionisprovidedforinformational

purposesonly.

Reset Button Globalresetformicro‐controllerandACO160chip





ACO160EVK

  Audio‐to‐SynthEvaluationSystem



4  999SW1

Ave.#1617,Miami,FL33130

QuickStartGuidetoyourACO160EVKsystem

ThankyouforchoosingtoevaluatethisACO160EVKsystem!Herearesomebasicinstructionstomake

themostoutofyourACO160EVKboard:

BasicSetup

1)Applypowerviatheincluded9vpowersupplyunit(PSU).Thisunitcanhandle100‐240VACatits

inputsowillworkworldwide,possiblywithonlyaadapterforyourlocalelectricsocketrequired.

2)ConnectanyaudioinputviatheNeutrikcombojack(XLRor¼”balancedorunbalanced).

3)Playyouraudiosourceatacomfortablevolumeandadjustthepreampgainuntilthehighestgreen

LEDlightsuponthepeaks.Ifthegainistoohigh,thepreampwillclipandthefundamentalfrequency

detectionmightnotwork.NotethattheredoverloadLEDdoesnotlightupnomatterhowlargethe

signalatthepreampout!

4)AdjustthegatethresholdsothatthegateLEDturnsonwhennoaudioisbeingplayed.Withplucked

stringinstrumentslikeguitaritmaytakesometuningtogetthegatetodifferentiateexactlywhena

noteisbeingplayedfromthelow‐leveltransientsthatoccurwhenyoumutethestrings.Trytosetthe

gatehighenoughsothattheLEDremainsonwhenthosequiettransienteventsoccur.

5)ForalmostallcasestheHPFandLPFcanbeleftintheirdefault,“open”settings(HPFOFFandLPFat

5kHz).Insomeextremecaseschangingthesefilteringsettingscanhelp,forexampleifyouuseacontact

micwithahandheldinstrumentandwanttofilteroutpotentiallow‐frequencyknocksorpercussive

effects.

ListeningtoACOAnalogOutputs

6)ListentotheACOoutputviathe¼”mainoutput.Tohearthedry+wetsound,connecta1/8”patch

cablebetweenthe“LINEOUT”andthe“AUXIN”minijacksandadjusttheAUXMIXknobtogetthe

desiredmix(fullyCCWfordry,fullyCWforwet).Adjustthemastervolume(“OUTLVL”)knobtogetthe

desiredlevelcomingoutoftheEVK.

7)SelectSIN/SAW/SQRwavesviathe3‐wayswitchtohearthedifferentACOwaveforms.

8)AdjusttheENVRATESELECTrotaryswitchtooptimizethefrequencytrackingfortheaudiosource

chosen.NOTE:Thisshouldbean8‐positionswitch,butinthisversionoftheEVKtheassemblyhouse

installeda4‐positionswitchbymistake.ImodifiedthePCBsothateveryotherratesettingisaccessible

fromthefastesttothesecondslowest.Instrumentswithveryfastattack/decayandlowpowerinthe

harmonics(likeguitarandbassguitar)shouldworkwellwithfastenveloperatesettings(CCW)whereas

instrumentswithslowerattack/decayandstrongharmonics(likebowedstrings)shouldworkwellwith

slowenveloperatesettings(CW).Humanvoiceshouldworkwellsomewhereinthemiddle.

9)Adjustthe“HARM”knobtohearthevariouspitchshiftsettings.Hereitisespeciallyusefultomixthe

dryandwetsignalstogethersoit’seasiertohearwhatharmonyintervalistuned.Notethatthe

harmonyknobiscontinuous,itdoesnotgiveyou“clicks”whenmovingfromoneharmonytoanother.

ACO160EVK

  Audio‐to‐SynthEvaluationSystem



5  999SW1

Ave.#1617,Miami,FL33130

10)PlacetheACOMode(S1)switchwiththeupperswitchintherightposition.Youmayhavetoreset

themicrocontrollerviatheresetpushbuttonswitch.AdjusttheSYNCFREQknobtoheartheeffectsof

hardsyncwithvarioussyncfrequencies.Hardsynconthesinewaveisespeciallyjuicy!Placetheupper

ACOModeswitchbackintheleftpositiontoenableMIDIoutput.

ControllingExternalSynthsViaCV/MIDI

11)PatchthePITCH,GATEandENVsignalsouttoananalogsynthofyourchoiceandenjoy“playing”

thatsynthwiththeaudiosourceofyourchoice!

12)ConnecttheMIDIoutputtothedigitalsynthofyourchoiceviaastandardMIDIDIN5cableandenjoy

“playing”thatsynthwiththeaudiosourceofyourchoice.



ACO160EVKCalibration

AllfunctionsinyourACO160EVKshouldbefullycalibratedbeforeshipmentbuthereisadescriptionof

thecalibrationoptions:

1)DCoffsetattheACObalancedinputiscontrolledviathe“OFFSET”trimpot.

2)PitchCV1v/octcalibrationiscontrolledbythe“PITCHCAL”and“PITCHOFFSET”trimpots.PITCHCAL

isadjustedtotunetheSLOPEofPITCHCVoutto1v/oct.PITCHOFFSETistunedtosettheabsolute

PITCHCVoutputascloseto50Hz=1vaspossible.NotethatthePITCHOFFSETtrimpotadjuststhelevel

intoa3‐bitflashADCwhichsetsthepitchoffsettooneofeightdiscretestepsandcanbetunedas

followsif50Hz=1visnotdesired:

FullyCCW:PITCHCV–210mV(50Hz=0.79v,100Hz=1.79v)

NextstepCW:PITCHCV–140mV(50Hz=0.86v,100Hz=1.86v)

NextstepCW:PITCHCV–70mV(50Hz=0.93v,100Hz=1.93v)

NextstepCW:PITCHCVnominal(50Hz=1v,100Hz=2v)

NextstepCW:PITCHCV+70mV(50Hz=1.07v,100Hz=2.07v)

NextstepCW:PITCHCV+140mV(50Hz=1.14v,100Hz=2.14v)

NextstepCW:PITCHCV+210mV(50Hz=1.21v,100Hz=2.21v)

FullyCW:PITCHCV+280mV(50Hz=1.28v,100Hz=2.28v)

3)TheHARMTUNEtrimpottunestheHARMINCVinputto1v/oct.NOTE:This1v/octscaleisaccurate

onlywhentheHARMknobistunedtotheunisonposition.IftheHARMknobistuneddifferentlythe

HARMINCVscalingmightdifferfrom1v/octslightly.

4)CALbutton.Pressingthisbuttoninitiatesafastthree‐pointauto‐calibrationproceduretotunethe

ACO160totheappropriateMIDInotes.Turnoffyouraudiosourceandturnthepreampandgate

thresholdknobsfullyCCWtoensurecalibrationcanbeexecutedsuccessfully.

5)Resetbutton.IfyoutrytoconvertanespeciallychallengingaudiosourcetoMIDI,itcanresultin

somestucknotes.PressingtheRESETbuttonshouldsendan“Allnotesoff”commandandresolveany

suchstucknotesituation.

ACO160EVK

  Audio‐to‐SynthEvaluationSystem



6  999SW1

Ave.#1617,Miami,FL33130



ACO160EVKSchematic–Page1

ACO160EVK

  Audio‐to‐SynthEvaluationSystem



7  999SW1

Ave.#1617,Miami,FL33130



ACO160EVKSchematic–Page2

ACO160EVK

  Audio‐to‐SynthEvaluationSystem



8  999SW1

Ave.#1617,Miami,FL33130



ACO160EVKSchematic–Page3

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